这意味着加速度与位矢平行。
So, that means the acceleration is parallel to the position.
推导出了用多极场空间谐波函数表示的磁矢位的通项表达式。
General expressions of the magnetic vector potential for multipole fields are derived.
前后径在轴位和正中矢状位上呈现相似的变化趋势。
AP dural sac diameter on axial and midsagittal images showed a similar tendency.
You can actually take derivatives of a vector with time.
你可以直接求位矢对时间的导数
More position vectors? I want to look at that.
例如其它的位矢,我想来看一下
That's the analog of the position vector.
那是和位矢相似的情况
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